Motor - Specifications Tab

See also: DC Motor Specifications Tab

Figure 1: Specifications Tab

Figure 2: Specifications Tab (Metric)

Option Description
Unit

Choose either US or Metric.

Power Type

The power type for the motor. Select from:

  • NPS (normal power supply—for example, one that has no power backup)
  • EPS (emergency power supply—for example, one that uses a generator for backup)
  • CPS (critical power supply—for example, one that uses an uninterrupted power source)

kV

Motor rated kV. This is normally 460 volts on a 480 volt base, or 2300 volts on a 2400 volt base.

Hp

Motor horsepower. Motors may be represented individually or as a lumped group. For a grouped motor, enter the total horsepower for the group.

This displays if the unit selected is US.

kW

Motor kilowatts. Motors may be represented individually or as a lumped group. For a grouped motor, enter the total kilowatts for the group.

This is displayed if the unit selected is metric.

RPM

Revolutions per minute. Used in output reports and defining equipment for ANSI or IEC standard short circuit calculation multipliers.

By default, ANSI uses 1800 and IEC uses 1500, unless the default equipment settings for motors are set to use a different value.

Load Class

To specify the class in terms of importance. You can select Essential, Critical, or Non-essential. This field does not affect analysis. It can be used in database query to distinguish a certain load class from others. See Advanced Query for more information.

FLA

Calculate looks up full load amps from NEC tables if the motor HP is listed in an NEC table. The full load amps field is not required, but a value greater than 0 affects how kVA is calculated. See Motor kVA Calculations.

PF

Motor operating power factor. This is used with the Efficiency field to determine kVA. Motor groups should use an average value of power factor.

Eff

Motor operating efficiency. This is used with the Power Factor field to determine kVA. Motor groups should use an average value of efficiency.

Service Factor

The factor by which the motor can be safely overloaded. You can select any value between 1.0 and 1.25.

Demand Factor

This factor is used to calculate the Demand kVA or Amps for the motor. The demand factor for a motor would be the ratio of maximum motor load to total rating of the motor.

One-line Graphics

With Adjustable Frequency Drive

Selecting this check box changes the motor symbol in the one-line as shown below.

Type

Motor type (induction, synchronous, synchronous condenser, or DC). This choice affects the motor impedances for short circuit calculations. The type also determines the one-line symbol for the motor.

These are the symbols if that are produced for each of the motor types if the connection type is D (delta) or Y (wye), which are both ungrounded types:

These are the symbols that are produced for each of the motor types if the connection is YG (grounded wye):

DC Motor Specifications Tab

Figure 3: Specifications Tab for DC Motors

Option Description

Unit

Choose either US or Metric.

Rated kV

Motor rated kV.

Hp/kW

Motor rated horsepower (U.S. units) or kilowatts (metric units).

RPM

Revolutions per minute.

Ia (Armature)

Rated armature current in amps.

Efficiency

Ratio of output mechanical power to input power.

R (Ohms)

Armature resistance in ohms. This affects the short circuit contribution.

Connected (%)

Scales the short circuit contribution from the motor.

Load Class

To specify the class in terms of importance. You can select Essential, Critical, or Non-essential. This field does not affect analysis. It can be used in database query to distinguish a certain load class from others. See Advanced Query for more information.

More Information